Grower-springer heifers have the highest risk for developing mastitis, says Jim Brett, veterinarian in Montezuma, Ga. That’s because, once bred, they become the least-monitored animals on the farm. Often, the environment for these animals is not kept as clean as the other animals, so the risk for mastitis exposure increases.

If you use fly tags, they need to be replaced after three or four months to provide adequate fly control. And to control mud — even the mud around water tanks — Brett recommends using lime or building a rock or gravel base so that the areas drain better. “Remember, mud is never an acceptable teat dip for any animal.”